(CNN) -- Residents are still dealing with the aftermath of Irene -- a massive storm that pummeled the East Coast.

The storm killed 43 people from Florida to New England and some of the worst flooding struck Vermont, New Jersey and upstate New York.

More than 1.1 million customers were still without power Thursday from North Carolina to Maine, the U.S. Department of Energy said.

Relief organizations are working to help victims in Irene's path. There are ways you can help.

At least 1,300 people awoke Wednesday morning in Red Cross shelters up and down the East Coast. The Red Cross has provided about 54,000 overnight shelter stays since the storm hit.

"The storm may be over, but our work is far from done," said Gail McGovern, Red Cross president. "We expect this disaster relief operation to be a very large operation that will continue for several weeks."

The organization has served more than 680,000 meals and snacks and has handed out more than 29,000 relief items such as hygiene kits, mops and tarps.

To donate to relief efforts, visit the website or text the word "REDCROSS" to 90999 to make a $10 donation.

Irene has also caused a shortfall of more than 2,700 blood donations over the past few days. To donate blood, go online or call 1-800-REDCROSS.

The Salvation Army is helping survivors who are still struggling with the floods and power outages left by Irene.

The organization has served nearly 150,000 meals, snacks and drinks to storm victims from the Carolinas to New England.

The group has been providing warm meals to evacuees and emergency responders in flood impacted northeastern states including New York and Vermont.

To make a donation, go online, call 1-800-SAL-ARMY or text "STORM" to 80888 to make a $10 donation. $10 will feed a disaster survivor for one day.

Samaritan's Purse teams are working in coastal North Carolina to help victims of Irene.

A Disaster Relief Unit has been set up in New Bern, North Carolina. Staff and volunteers began removing downed trees and assisting homeowners on Sunday afternoon.